PUMP IT UP:VERTICAL OR HORIZONTAL

PUMP STATIONAmanda Powers, P.E.

Sam Meisner, P.E.

1

WHAT IS A PUMP?• A machine that imparts kinetic

and potential energy to a liquid to force a discharge from the machine.

• A machine that moves a volume of liquid from a lower to higher elevation or energy level

• A machine that moves liquid along a pipeline.

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HORIZONTAL SPLIT CASE PUMP• Type of Centrifugal Pump

• Shaft & Impeller Horizontally Supported between Bearings

• Case Split at Shaft• Bottom or Side Suction

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Suction Discharge

Suction

Suction

Suction

Discharge

1

5

4 3

Suction

2

VERTICAL TURBINE PUMPS

4Pump

Suction

Discharge

1

3

4

• Type of Centrifugal Pump• Shaft and Impeller Supported Vertically

• Pump is Immersed During Operation

1

2

VERTICAL TURBINE PUMPS

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6

4

3

2

5

PLAN VIEW: HORIZONTAL VS. VERTICAL

Horizontal Split Case Pumps

Vertical Turbine Pumps

Suction

Discharge

DischargeSuction

*Water Level is Below Grade

SECTION VIEW: HORIZONTAL VS. VERTICAL

Horizontal Split Case Pumps Vertical Turbine Pumps

Suction Discharge

Discharge

Suction

*Water Level is Below Grade

SECTION VIEW: HORIZONTAL VS. VERTICAL

Horizontal Split Case Pumps

Vertical Turbine Pumps

*Water Level is Above Grade

DischargeSuction

Suction

Discharge

SYSTEM CURVES: HORIZONTAL / VERTICAL

HORIZONTAL SPLIT CASE PUMP - ADVANTAGES• Ease of Maintenance

• Fewer Bearings• Removable Casing• Easy Access• Shorter Duration of Downtime

• Generally Longer Life• High Efficiencies• Various Suction Orientations

• Flexibility in Station Arrangement• Mechanically Stable at Variable

Speeds• Lower Cost if Water Level is

Above Grade 10

HORIZONTAL SPLIT CASE PUMP – DISADVANTAGES• Larger Station Footprint - Typically• Pump & Appurtenances Below Water Level• Below Grade - Subject to Flooding

• Best Case Scenario - Build at Grade Level

• Capacity and Head Only Added with Additional or Replacement Pumps

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VERTICAL TURBINE PUMPS - ADVANTAGES

• Smaller Station Footprint• Add Head with Stages• Naturally Steeper Curve

can Cover Large Head Range

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VERTICAL TURBINE PUMP - DISADVANTAGES• Maintenance Burden

• Larger Number of Parts• Harder to Access Pumping Equipment• Increased Maintenance Downtime

• Lower Efficiencies• Requires Study & Modifications

if Variable Speed Applications

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CASE STUDY – SITE CONGESTION + HYDRAULICS

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CASE STUDY – VTP ON TOP OF BURIED STORAGE TANK

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CASE STUDY – PUMP O&M + STATION ACCESSIBILITY

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CASE STUDY – BELOW GRADE HSCP

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DECISIONS…

FACTORS TO CONSIDER FRONTRUNNER

Limited Space Available Vertical

Water Level Above Grade Horizontal

Water Level Below Grade Vertical

Large Range of Flow and Head Vertical

Criticality of Station and Maintenance Downtime Horizontal*

Variable Speed Horizontal

Life Cycle Cost Vertical / Horizontal

Hydraulics (Suction & Discharge) Vertical / Horizontal

Pump Availability Vertical / Horizontal

Familiarity & Preference of Client/End User Vertical / Horizontal

Other? Vertical / Horizontal18

* If below grade, must consider risk of station flood

QUESTIONS?